Profibus DP Mk2 Option Card Installation Manual
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Publication PUB088-005-00_1017
connected by linking the highway
‘1A Out’ terminal to the highway 1 ‘Terminator’ terminal (blue link in
diagram above) and fitting the internal links LK1 and LK2 in the Terminate position; and by linking the
highway
‘2A Out’ terminal to the highway 2 ‘Terminator’ terminal and fitting the internal links LK3 and
LK4 in the Terminate position. Take care to ensure that the correct polarity is observed on the data
highway connection.
Data line 1B is p
ositive with respect to data line 1A when the PFU is transmitting a ‘1’.
Data line A is also called TxD/RxD-N
Data line B is also called TxD/RxD-P
Both the Dual card options default to System Redundancy; this allows two separate highways to be
used. When the RedCom compliant version is used the card uses RedCom extensions to the standard
DP V1 protocol to permit redundancy to be used in a controlled manner. The host system should be
able to support V1 messages and RedCom, if it cannot then the Simple redundant option should be
used.
Active termination resistors are included on the Profibus card. The jumper links LK1 to LK4 on the
PNIC board are used to select the inclusion of these resistors.
Fit LK1, LK2, LK3 and LK4 as shown to provide pull apart active termination to the
network at this actuator and
Link Terminals ‘Terminator 1’ and ‘Profibus 1A’ and ‘Terminator 2’ to ‘Profibus 2A’ to add
end of line termination
Fig 23: Dual Highway Active Termination Links for SR mode
SK5
SK7
SK10
EPROM
SK1
SK2
SK8
LK1
SK3
LK3
LK4
Links shown
in 'Terminate'
position
LK1
LK2
